Apache Commit Visualisation - code_swarm
The video below is a brilliant piece of work by Michael Ogawa - a visualisation of the commit history of the Apache httpd. It was built using Processing and the source is here, theoretically (i.e. I haven’t tried) allowing you to produce a similar visualisation for any project.
code_swarm - Apache from Michael Ogawa on Vimeo.
I suggest viewing it in full-screen mode.
There are several other examples available at the project page. Impressive though it is, I can’t help thinking that an interactive version of this would elevate the concept from eye-candy to something extremely useful.
Update: Ok, an interactive version like this perhaps. Wow!